Arsenal(Ar"se*nal), n. [Sp. & F. arsenal arsenal, dockyard, or It. arzanale, arsenale (cf. It. & darsena
dock); all fr. Ar. darina'a house of industry or fabrication; dar house + ina art, industry.] A public establishment
for the storage, or for the manufacture and storage, of arms and all military equipments, whether for
land or naval service.

1.(Chem.) One of the elements, a solid substance resembling a metal in its physical properties, but in
its chemical relations ranking with the nonmetals. It is of a steel- gray color and brilliant luster, though
usually dull from tarnish. It is very brittle, and sublimes at 356° Fahrenheit. It is sometimes found native,
but usually combined with silver, cobalt, nickel, iron, antimony, or sulphur. Orpiment and realgar are two
of its sulphur compounds, the first of which is the true arsenicum of the ancients. The element and its
compounds are active poisons. Specific gravity from 5.7 to 5.9. Atomic weight 75. Symbol As.